Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Provision for/(benefit from) income taxes	$ 128.0		$ (151.0)	$ (888.0)	$ 407.0
Deferred tax asset from intra-entity sale		$ 3,442.0
Net one-time benefit		$ 939.0
Other (income) and expense
Noncontrolling interest amounts, net of tax	$ 3.4		$ 7.1	$ 14.7	$ 19.0